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/*
* This file is part of libextractor.
* (C) 2006, 2009, 2012 Toni Ruottu and Christian Grothoff
*
* libextractor is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 3, or (at your
* option) any later version.
*
* libextractor is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with libextractor; see the file COPYING. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
/**
* @file plugins/nsf_extractor.c
* @brief plugin to support Nes Sound Format files
* @author Toni Ruottu
* @author Christian Grothoff
*/
#include "platform.h"
#include "extractor.h"
/* television system flags */
#define PAL_FLAG 0x01
#define DUAL_FLAG 0x02
/* sound chip flags */
#define VRCVI_FLAG 0x01
#define VRCVII_FLAG 0x02
#define FDS_FLAG 0x04
#define MMC5_FLAG 0x08
#define NAMCO_FLAG 0x10
#define SUNSOFT_FLAG 0x20
/**
* Header of an NSF file.
*/
struct header
{
/**
* Magic code.
*/
char magicid[5];
/**
* NSF version number.
*/
char nsfversion;
/**
* Number of songs.
*/
unsigned char songs;
/**
* Starting song.
*/
unsigned char firstsong;
/**
* Unknown.
*/
uint16_t loadaddr;
/**
* Unknown.
*/
uint16_t initaddr;
/**
* Unknown.
*/
uint16_t playaddr;
/**
* Album title.
*/
char title[32];
/**
* Artist name.
*/
char artist[32];
/**
* Copyright information.
*/
char copyright[32];
/**
* Unknown.
*/
uint16_t ntscspeed;
/**
* Unknown.
*/
char bankswitch[8];
/**
* Unknown.
*/
uint16_t palspeed;
/**
* Flags for TV encoding.
*/
char tvflags;
/**
* Flags about the decoder chip.
*/
char chipflags;
};
/**
* Give metadata to LE; return if 'proc' returns non-zero.
*
* @param s metadata value as UTF8
* @param t metadata type to use
*/
#define ADD(s,t) do { if (0 != ec->proc (ec->cls, "nsf", t, EXTRACTOR_METAFORMAT_UTF8, "text/plain", s, strlen (s) + 1)) return; } while (0)
/**
* "extract" meta data from a Nes Sound Format file
*
* NSF specification version 1.61 was used, while this piece of
* software was originally written.
*
* @param ec extraction context
*/
void
EXTRACTOR_nsf_extract_method (struct EXTRACTOR_ExtractContext *ec)
{
char album[33];
char artist[33];
char copyright[33];
char songs[32];
char startingsong[32];
char nsfversion[32];
const struct header *head;
void *data;
ssize_t ds;
ds = ec->read (ec->cls,
&data,
sizeof (struct header));
if ( (-1 == ds) ||
(sizeof (struct header) > ds) )
return;
head = data;
if (NULL == head)
return;
/* Check "magic" id bytes */
if (memcmp (head->magicid, "NESM\x1a", 5))
return;
ADD ("audio/x-nsf", EXTRACTOR_METATYPE_MIMETYPE);
snprintf (nsfversion,
sizeof(nsfversion),
"%d",
head->nsfversion);
ADD (nsfversion, EXTRACTOR_METATYPE_FORMAT_VERSION);
snprintf (songs,
sizeof(songs),
"%d",
(int) head->songs);
ADD (songs, EXTRACTOR_METATYPE_SONG_COUNT);
snprintf (startingsong,
sizeof(startingsong),
"%d",
(int) head->firstsong);
ADD (startingsong, EXTRACTOR_METATYPE_STARTING_SONG);
memcpy (&album, head->title, 32);
album[32] = '\0';
ADD (album, EXTRACTOR_METATYPE_ALBUM);
memcpy (&artist, head->artist, 32);
artist[32] = '\0';
ADD (artist, EXTRACTOR_METATYPE_ARTIST);
memcpy (©right, head->copyright, 32);
copyright[32] = '\0';
ADD (copyright, EXTRACTOR_METATYPE_COPYRIGHT);
if (0 != (head->tvflags & DUAL_FLAG))
{
ADD ("PAL/NTSC", EXTRACTOR_METATYPE_BROADCAST_TELEVISION_SYSTEM);
}
else
{
if (0 != (head->tvflags & PAL_FLAG))
ADD ("PAL", EXTRACTOR_METATYPE_BROADCAST_TELEVISION_SYSTEM);
else
ADD ("NTSC", EXTRACTOR_METATYPE_BROADCAST_TELEVISION_SYSTEM);
}
/* Detect Extra Sound Chips needed to play the files */
if (0 != (head->chipflags & VRCVI_FLAG))
ADD ("VRCVI", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
if (0 != (head->chipflags & VRCVII_FLAG))
ADD ("VRCVII", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
if (0 != (head->chipflags & FDS_FLAG))
ADD ("FDS Sound", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
if (0 != (head->chipflags & MMC5_FLAG))
ADD ("MMC5 audio", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
if (0 != (head->chipflags & NAMCO_FLAG))
ADD ("Namco 106", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
if (0 != (head->chipflags & SUNSOFT_FLAG))
ADD ("Sunsoft FME-07", EXTRACTOR_METATYPE_TARGET_ARCHITECTURE);
}
/* end of nsf_extractor.c */
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